Pigment.



PIGMENT.

Specification of Letters Patent.

Patented May 5, NEWS.

Application filed September 26. 1907. Serial No. 394,649.

"lb (ill whom it may concern:

Be it known that l, Josnrii C. llEcKMAN, a resident of Avalon, in thecounty of Allegheny and State of Pennsylvania, have invented a new and.useful Improvement in Pigments; and i do hereby declare the followingtobe afuli, clear, and exactdcscrip tion thereof.

.My invention relates to pigments.

as of no commercial value.

As the apparatus employed in the manufacture of my improved pigment isof a common form well known to those skilled in the art I have notdeemed it necessary to accompany the description of my invention withdrawings.

The waste product which I employ in the manufacture of my pigment isobtained from coal mines and is most commonly known as coal mine sulfur.This product is discharged from the mines by the water which drains fromthe same, and hnds its way usu: ally to the neighboring creeks andstreams.

I collect this product by constructing a reservoir or dam in the streamwhere the water is held substantially in a state of rest so as to givethe product an opportunit to precipitate and fall to the bottom. lisprecipi tate in the form of a line powder is then col lectcd from thebottom of the reservoir. It may be obtained by other methods, such as bycollecting the water front the mines in shallow pans or basins andallowing the water to evaporate, leaving the fine dust or impalpablcpowder. This product is yellow substance and when analyzed is found toand sulfuric acid combined with iron, together with slight traces oflinic and magnesia. may be subjected to the action of heat in the formin which it is recovered and when calcined n'oduccs a good pigment, butby treating the product with the addition ofsulfuric acid and thencalcining the same I obtain-a pigment Very rich in iron oxid and of aThe object of my invention is to provide aigmcnt of high color andbrilliancy made. mm a waste product heretofore accounted This productbrilliant red color, which when mixed with suitable oils, turpentine,etc, gives a paint of so high color and great tinting capacity.

In manufacturing my improved pigment i. may introduce into a suitablcvat or rcservoir one part of the coal mine Sl1 fl11",i i10in one-fifthof one part to one part sulfuric acid a and one-fifth to one part waterby weight, and after thoroughly mixing the same the mixture is allowedto stand for a suiiicient length of time to give the sulfuric acid cicnttime to thoroughly act on the iron and an thus convcrt it into compoundswhich through subsequent stages of the process, to wit, cclcination, arercadil r converted into red oxid of iron. After tic mixture has stoodfor the length of time required, say from twelve to thirty-six hours,said mixture will be in the form of a semi-fluid or nasty mass, which Ithen introduce into a suitable muii'lc or revcrberatory furnace. Heat isthen applied and the mass is calcined and "I0 reduced to a pulverulentform.-- (Where i produce the iginent from the coal mine suliur-without te addition of the sulfuric acid, the coal mine sulfur is introduced in.its dr state into a suitable furnace where it is ca I cined. WhileI amable to obtain a ver good pigment by calcining the coal mine suiur inits original state, yet, as stated above, by the addition of thesulfuric acid I obtain a more brilliant color and a paint of greatertinting so capacity.) The pigment so produced may. then be mixed withsfgitable oils, turpentine, 8*; to produce a pal t adapted for paintingiron or wood work, and may also be employedas a coloring for many otherlines of manufacture. In my invention I am enabled to make use of awaste product heretofore accounted as of no value, and obtain a pigmenthaving-it high color and as great strength as the pres ent establishedstandard. The product from which I manufacture my new pi incntmay be hadfor the more cost of co lccting the same.

What 11 claim is:

1'. As a new product of manufacture, a

ur wlth a mineral sold and than calcinmg 1n lts 0r1gina1state.- '10 thesame; In testimony whereof, I the said JosEvn' 2. As a new article ofmanufacture, a 1g- (J. .HECKMAN have hereunto set my hand.

Fi 'IDQIIt obtainled by heating coal mine suiment obtained by calciningcoal mine sulfur iuientubtain ed by treating coal mine su Fur JOSEPH CHECKMAN.

with sulfuric and and then calcining the Witnesses:

sa -me; I g ROBERT C. TOTTEN,

Ase, new al ticle of manufacture, a pig- R031. D. TOTTEN.

